Blast furnace wall structure



Oct. 25, 1949. G. WEHR 2,486,348

BLAST FURNACE WALL STRUCTURE Filed 001:. 9. 1945 WITNESSES: INVENTOR ATTORN Y Patented Oct. 25, 1949 2,486,348 v r BLAST FURNACE WALL STRUCTURE Guy Wehr, Steubenville, Ohio, assignor to William M. Bailey Company, poration of Pennsylvania Pittsburgh, Pa., a col'-.

Application October 9, 1945, Serial No. 621,326

2 Claims.

This invention relates to blast furnace structures, more particularly to blast furnace tops in the region of the charging zone, and it is among .the objects thereof to provide an improved wall v structure at the stock line, including wearing plates set in a monolithic concrete wall of circular contour to resist the shock of the impact of the stock as it is charged from the bell into the furnace chamber.

Another object of the invention is the provision of a. shock-proof wall at the stock line of blast furnaces which comprises a composite structure of flared wearing plates embedded in concrete and separated by fire brick in which the wearingplates are of a unique construction especially designed to resist impact and wear.

These and other objects of the invention will become more apparent from a consideration of the accompanying drawing, constituting a part hereof, in which like reference characters designate like parts, and in which Fig. 1 is a partial vertical cross-sectional view of the top of a blast furnace in the region of the stock line showing an arrangement of wearing plates and wall structure embodying the principles of this invention;

Fig. 2 a cross-sectional view of a portion of the furnace wall taken along the line 2-2 of Fig. 3;

Fig. 3 an elevation of a group of wearing plates taken along the line 3-3, Fig. 1; and

Figs. 4 and 5 views in perspective of different forms of wearing plates employed in the composite construction of the wall of Fig. 1.

In the drawing the numeral I generally designates the cylindrical wall of the top of a blast furnace terminating in a charging chamber 2 in which is movably disposed a charging hell 3, the charge, such as iron ore, coke and limestone, being successively dumped from chamber 2 to the top of the furnace by lowering of the bell '3: at intervals. The wall I is of standard construction in the region 4 and the present invention deals with the wall portion immediately belowthe charging bell which is known as the stock line. This portion is joined with the casting of the charging chamber 2 by a heat insulatedcom'cal wall portion 5 which consists of cast metal plates and insulation disposed therebetween.

The stock line wall consists of a monolithic concrete ring 6 in which are embedded anchorages I and'annular reinforcing rods 8 of wearing plates 9 arranged in superposed relation as shown with fire brick I0 disposed therebetween, the construction of the wear plates 9 being more clearly shown in Fig. 4. At the upper region of the wall a special form of wear plate similar to the plates 9, designated by the numeral II,

member I2 which is joined to the plate II as by welding, the member I2 being reinforced by a bar I3 which is welded to the underside of the body I2 and the upper face of the plate II. As shown in Fig. 5, the upper flared wearing plates are provided with anchorages I4 which are disposed in a horizontal plane in the monolithic concrete wall 6 instead of the vertically disposed members I of the plates 9 to engage vertical reinforcing rods 6a. The top of the wall is insulated with the usual fire brick I5 and the outer wall of the furnace is of conventional construction consisting of brick I6 and sheathing H.

The wall is constructed by first assembling the sheathing I1 and then building a lining of the soft brick I6 which acts as a form for pouring the monolithic concrete ring 6 in which the wearing plate anchorages are embedded. This simplifies not only the construction but prevents bursting of the sheathing from the expansion of the concrete which is taken up by the softer brick l6. It

also prevents shattering of the concrete ring which may occur due to internal stresses when it is poured in a form as is conventional practice.

As is evident fromthe cross-section of Figs.1 and 2, the wearing plates with their anchorages and reinforcing disposed in the monolithic concrete ring is of durable construction capable of resisting the most severe shock from charging, especially when at times metal bodies are charged into the chamber 2 which strike against the fur- .nace wall in the region of the stock line. The

composite construction of the concrete wall and fire brick protects the concrete wall which, in the main, serves as an anchorage for the wear plates, and the plates, except where exposed on the inner wall of the furnace, are protected against excessive heat by the fire brick. I0 disposed therebetween.

It is evident from the foregoing description that blast furnace walls constructed in accordance therewith provide shock resistant wear-proof and durable surfaces greatly extending the life of the furnace and eliminating the necessity for rebuilding which in conventional types of furnaces must be done at rather frequent intervals.

Although one embodiment of the invention has been herein illustrated and described, it will be evident to those skilled in the art that various modifications may be made in the details of construction without departing from the principles herein set forth.

is provided, the plate having an outwardly flaring apron-like asses-24s I claim:

1. In a blast furnace wall, a wall portion in the region of the stock line comprising a monolithic concrete ring having steel reinforcing therein including annular reinforcing rods and having wearing plates with extension rods secured thereto, the ends of said rods being embedded in said concrete ring and extending horizontally from the wearing plates, said rods extending radially outward of said annular reinforcing rods to interlock therewith, an annular wall of brick within the concrete wall, and said wearing plates being imbedded in said brick and having flanged ends forming a continuous wearing surface on the inner face of the brick wall.

2. A wearing plate for blast furnace walls comprising an L-shaped plate having anchorage rods 4 secured integrally thereto, said rods having their free ends bent inward, a flared apron integrally joined to the L-shaped plate at the front end thereof, and extending backward therefrom at 5 an acute angle.

GUY WEI-IR.

REFERENCES CITED The following references are of record in the 10 file of this patent:

UNITED STATES PATENTS 

